This paper discusses mobility control in the Joffre Viking field miscible CO 2 flood. Since 1984, three injection strategies have been tried: water-alternating-C0 2 (WAC0 2 ), continuous CO 2 , and simultaneous CO 2 and water. The studies showed that simultaneous injection results in the best CO 2 conformance. COrfoam injection has also been investigated.
this article begins on the next page F F JCPT85-01-01 ENHANCED OIL RECOVERY Tertiary recovery potential of CO, flooding in Joffre Viking Pool, Alberta S.C.M. KO Ultramar Oil and Gas Canada Limited P.M. STANTON Scientific Software-intercomp D.J. STEPHENSON Vikor Resources Ltd.ABSTRACT Reservoir simulation models were used to investigate the feasibility and predict performance of a tertiary C02 flood in Joffre Viking sand unit of central Alberta. Using a black oil simulator, history matching ofprimary and waterfloodproduc-tion performance on a selected portion of the Joffre Viking Pool involving 85 wells wasfirst undertaken. This step providedfor proper initialization of fluid and pressure distribution and a reservoir description for the miscible CO, flood inodel. Reser-voir fluid samples taken from a producing well were recom-binedfor laboratory swelling and stitn tube displacement tests. The results of these tests were then usedfor characterization Of the C02-oil system for the miscible model. Further sensitivity analysis and process optimization using a "typical pattern approach was conducted to optimize the tertiar y C02 flood performance. Simulation results indicated that in the presence of a trapped oil saturation due to water blocking oilfrom con-tact by the injected C@,, a larger C02 slug andlor a smaller water slug were required in a water-alternating-with-gas (WAG) process for more efficient displacements. In addition, the C02 flood performance prediction of a potential develop-ment scheme for the study area based on a fully developed 32-hectare drilling density, five-spot pattern with a three-cycle WAG process and a total C02 volume equal to 25 per cent hydrocarbon pore volume is presented. Introduction Significant potential for tertiary oil recovery by C02 flooding as determined in an earlier preliminary model study(]) promp-ted further detailed evaluation of the CO, tertiary recovery process for the Joffre Viking Pool in Alberta. This investiga-tion is particularly timely in view of the enhanced oil recovery (EOR) incentives provided by both the federat and provincial governments. It is also considered timely in view of the long lead time required for the design, planning and implementa-tion of an EOR scheme. As indicated by the expanded efforts put forth by the oil companies in the United States, EOR can _ Keywords: Enhanced oil recovery, Tertiary recovery, CarboD dioxide flooding, Joffre Viking pool, Waterflooding, Reservoir simulation. be a significant contributor to increasing domestic oil produc-tion and therefore improving the chances of achieving energy self-sufficiency in Canada.To provide a more detailed evaluation and prediction of the tertiary C02 flood, laboratory testing and reservoir modelling were used in this study. The application of reservoir simulation models for the design and evaluation of CO, floods has been reported previously in the literature(2-6). The main objective of this study was to investigate the feasibility of C02 flooding in the Joffre Viking reservoir. A substantial p...
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